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Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | [1] | $ 3,451 | $ 3,179 | $ 10,005 | $ 9,376
Net income (loss) attributable to Dominion Energy |  | 854 | 665 | 1,806 | 1,687
Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | [2] | 2,232 | 2,154 | 5,809 | 5,732
Net income (loss) attributable to Dominion Energy |  | 520 | 459 | 1,043 | 1,133
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | [3] | 423 | 401 | 1,408 | 1,313
Net income (loss) attributable to Dominion Energy |  | 136 | 117 | 317 | 302
Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | (175) | (361) | (551) | (1,120)
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 3,451 | 3,179 | 10,005 | 9,376
Adjustments/Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | (2) | 206 | 40 | 660
Net income (loss) attributable to Dominion Energy |  |  | 0 | 0 | 0
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | (177) | (155) | (511) | (460)
Power Delivery |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 596 | 580 | 1,687 | 1,664
Net income (loss) attributable to Dominion Energy |  | 163 | 138 | 464 | 390
Power Delivery | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 5 | 4 | 17 | 16
Power Delivery | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 601 | 584 | 1,704 | 1,680
Power Delivery | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 595 | 580 | 1,686 | 1,670
Net income (loss) attributable to Dominion Energy |  | 163 | 137 | 462 | 387
Power Generation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 2,021 | 1,931 | 5,516 | 5,091
Net income (loss) attributable to Dominion Energy |  | 414 | 369 | 1,038 | 870
Power Generation | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 3 | 3 | 8 | 8
Power Generation | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 2,024 | 1,934 | 5,524 | 5,099
Power Generation | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 1,637 | 1,574 | 4,338 | 4,062
Net income (loss) attributable to Dominion Energy |  | 347 | 314 | 796 | 735
Gas Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 836 | 459 | 2,972 | 1,949
Net income (loss) attributable to Dominion Energy |  | 264 | 187 | 840 | 613
Gas Infrastructure | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 7 | 204 | 21 | 645
Gas Infrastructure | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 843 | 663 | 2,993 | 2,594
Gas Infrastructure | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 423 | 401 | 1,408 | 1,313
Net income (loss) attributable to Dominion Energy |  | 146 | 121 | 421 | 318
Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  |  | 3 | (210) | 12
Net income (loss) attributable to Dominion Energy |  | 13 | (29) | (536) | (186)
Corporate and Other | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 160 | 150 | 505 | 451
Corporate and Other | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 160 | 153 | 295 | 463
Corporate and Other | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  |  | 0 | (215) | 0
Net income (loss) attributable to Dominion Energy |  | 10 | 8 | (215) | 11
Corporate and Other | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 0 | 0 | 0 | 0
Net income (loss) attributable to Dominion Energy |  | $ (10) | $ (4) | $ (104) | $ (16)
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 18 for amounts attributable to affiliates.
[3] | See Note 18 for amounts attributable to related parties.

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